One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,5,7)(3,4,8,6)(10,13)(14,16)(17,18)(19,27)(20,24)(21,25)(22,26)(23,28)(29,32)(30,31)(9,10,12,13)(11,14,15,16)(17,19)(18,23)(20,29)(21,31)(22,28)(24,25)(26,27)(30,32)(1,3,5,8)(2,6,7,4)(19,28)(21,29)(23,27)(25,32)(1,3)(2,4)(5,8)(6,7)(17,20)(18,24)(19,29)(21,28)(22,31)(23,25)(26,30)(27,32) involution — undirected(1,4)(2,3)(5,6)(7,8)(9,11,12,15)(10,14,13,16)(17,18)(19,23)(20,30)(21,25)(22,26)(24,31)(27,28)(29,32)(17,21,22,29)(18,25,26,32)(19,20,28,31)(23,30,27,24)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.